/*  mbed Microcontroller Library
    Copyright (c) 2006-2013 ARM Limited

    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.
    You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

    Unless required by applicable law or agreed to in writing, software
    distributed under the License is distributed on an "AS IS" BASIS,
    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    See the License for the specific language governing permissions and
    limitations under the License.
*/
#include "InterruptIn.h"

#if DEVICE_INTERRUPTIN

namespace mbed {

    InterruptIn::InterruptIn(PinName pin) : gpio(),
        gpio_irq(),
        _rise(),
        _fall() {
        gpio_irq_init(&gpio_irq, pin, (&InterruptIn::_irq_handler), (uint32_t)this);
        gpio_init_in(&gpio, pin);
    }

    InterruptIn::~InterruptIn() {
        gpio_irq_free(&gpio_irq);
    }

    int InterruptIn::read() {
        return gpio_read(&gpio);
    }

    void InterruptIn::mode(PinMode pull) {
        gpio_mode(&gpio, pull);
    }

    void InterruptIn::rise(void (*fptr)(void)) {
        if (fptr) {
            _rise.attach(fptr);
            gpio_irq_set(&gpio_irq, IRQ_RISE, 1);
        } else {
            gpio_irq_set(&gpio_irq, IRQ_RISE, 0);
        }
    }

    void InterruptIn::fall(void (*fptr)(void)) {
        if (fptr) {
            _fall.attach(fptr);
            gpio_irq_set(&gpio_irq, IRQ_FALL, 1);
        } else {
            gpio_irq_set(&gpio_irq, IRQ_FALL, 0);
        }
    }

    void InterruptIn::_irq_handler(uint32_t id, gpio_irq_event event) {
        InterruptIn* handler = (InterruptIn*)id;
        switch (event) {
            case IRQ_RISE: handler->_rise.call(); break;
            case IRQ_FALL: handler->_fall.call(); break;
            case IRQ_NONE: break;
        }
    }

    void InterruptIn::enable_irq() {
        gpio_irq_enable(&gpio_irq);
    }

    void InterruptIn::disable_irq() {
        gpio_irq_disable(&gpio_irq);
    }

    #ifdef MBED_OPERATORS
    InterruptIn::operator int() {
        return read();
    }
    #endif

} // namespace mbed

#endif
